Rand Water | Integrated Annual Report 2025

ORGANIC CONTAMINANTS The occurrence of emerging organic contaminants in the drinking water value chain (from source to tap) is a growing concern for the drinking water industry and consumers, given the adverse health risks these contaminants pose to consumers. These adverse health effects include endocrine disruption, toxicity, teratogenicity, mutagenicity, and carcinogenicity. Currently, SANS 241 does not address most of the emerging contaminants of concern. However, Rand Water, in the interest of public health, has implemented monitoring programmes for an extended list of organic contaminants. The identified organic contaminants include industrial chemicals, pesticides, disinfection by-products, and cyanobacteria toxins. An assessment of the identified contaminants is conducted biannually to determine potential risks to customers. The table below contains the results of organic compounds that were assessed in the Rand Water drinking water value chain. None of these compounds were detected at levels that are of concern to human health. Table 22: Organic Contaminants Assessment in Drinking Water Supply Value Chain Compliance report for organic contaminants assessment in Rand Water drinking water supply value chain: 2024/25 FY Organic contaminants Unit of Measure Guidelines Limit Analysing laboratory Reporting Limit No. results Achieved compli ance level (%) Limit Source Value Units DISINFECTION BYPRODUCTS Bromodichloroform µg/l 60 SANS241 RW <10 ug/l 31 100% Bromoform µg/l 100 SANS241 RW <10 ug/l 31 100% Chloroform µg/l 300 SANS241 RW <10 ug/l 31 100% Dibromochloroform µg/l 100 SANS241 RW <10 ug/l 31 100% INDUSTRIAL CHEMICALS 2,4-Dinitrotoluene ng/l 100000 USEPA RW <20 ng/l 31 100% 2,6-Dinitrotoluene ng/l 40000 USEPA RW <25 ng/l 31 100% Acenaphthylene ng/l 0.02x10 6 USEPA RW <45 ng/l 31 100% Anthracene ng/l 10x10 6 USEPA RW <35 ng/l 31 100% Benz[a]anthracene ng/l 100 MDH RW <25 ng/l 31 100% Benzene ng/l 10 WHO RW <1 ng/l 31 100% Benzo[a]pyrene (PAHs) ng/l 700 WHO RW <40 ng/l 31 100% Benzo[b]fluoranthene ng/l 100 EU RW <20 ng/l 31 100% Benzo[g,h,i]perylene ng/l 100 EU RW <20 ng/l 31 100% Benzo[k] fluoranthene ng/l 100 EU RW <35 ng/l 31 100% Bisphenol A ng/l 20 MDH M&L <10 ng/Mℓ 31 100% Butyl benzyl phthalate ng/l 100 MDH M&L <20 ng/l 31 100% Chrysene ng/l 200 USEPA RW <30 ng/l 31 100% cis Chlordane ng/l 2000 USEPA RW <60 ng/l 31 100% Cyanazine ng/l 600 WHO RW <30 ng/l 31 100%

di(2-ethylhexyl)- phthalate (DEHP)

ng/l

8000

WHO

M&L

<20

ng/l

31

100%

Dibenz[a,h] anthracene

ng/l

300

USEPA

RW <40

ng/l

31

100%

Di-n-butylpthalate (DBP)

µg/l

20

MDH

M&L

<20

µg/l

31

100%

150

Rand Water | Integrated Annual Report 2025